针对锂电池供电系统的单片电源和管理集成电路

ZHCS945–JUNE针对锂电池供电系统的单片电源和电池管理集成电路查询样品40引脚四方扁平无引线(QFN)封装(6mm 集成的3.0VLDO稳压6mm)并带有 集成的3.2VLDO稳压 带有2个状态引脚和安全定时器的550mA锂离 集成的4.25V同步升压转换器( )和低压降稳 压器(LDO)为LED提供电压源 用于系统中每个功能的4个 USB )控制的3个LED驱动借助于电源路径电路，USB端口、AC-DC3.2VLDO输出稳压器电源。这样就防止了系统中的不稳定性。ORDERINGORDERABLEPARTTOP-SIDE–10°CtoRHAPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddierstheretoappearsattheendofthisdatasheet.Copyright©2012,TexasInstrumentsPowerPADisCopyright©2012,TexasInstrumentsPRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheInstrumentsstandardwarranty.Productionprocessingdoes EnglishDataSheet:necessarilyincludetestingofallThisintegratedcircuitcanbedamagedbyESD.TexasInstruments mendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.TYPICAL

100 100

77

CircuitrywithLi-ion

6.8

4.25-Boost

0.01

22M

X5R

Note1:RSET1=2.1k,RSET2=8.2PowerinputfromUSB 380mACHARGE38mAPRECHARGEPowerinputfromACDCadaptor:480mACHARGE48mAPRECHARGENote2:TAIYOYUDENNR4018T6R8MorTheselogicinputsandoutputsinterfacearebasedon3.2VPIN

○123456 TERMINALEXTERNALREQUIREDCOMPONENTS(SEETYPICALAPPLICATION)35,PowerinputfromAC-DC1-µFcapacitortoAGNDtominimizeovervoltagetransientsduringACpowerhot-plugevents.AlsoZenerdiodeforsurgeprotectionisconnected.33,PowerinputfromUSB-1-µFcapacitortoAGNDtominimizeovervoltagetransientsduringBUSpowerhot-plugevents.AlsoZenerdiodeforsurgeprotectionisconnected.VBUSpower-goodstatusoutput.(CMOSCanbeusedtoindicatePowerGoodsignaltoVACpower-goodstatusoutput(CMOSCanbeusedtoindicatePowerGoodsignalto9Chargestatusoutput1(open-drainConnect100-kΩexternalpullupresistorbetweenSTAT1andVLDO1.8Chargestatusoutput2(open-drainConnect100-kΩexternalpullupresistorbetweenSTAT2andVLDO1.ChargecurrentsetpointforVBUSExternalresistorfromISET1pinandAGNDpinsetschargecurrentvaluewhenthepowerinputfromUSB-port.ChargecurrentsetpointforVACExternalresistorfromISET1pinandISET2pinsetschargecurrentvaluewhenthepowerinputfromAC-DCadapter.Chargeenableinput(activeChargeenablesignalfrom5Powerinputforboostregulator.ItisconnectedtotheLi-ionbattery.ConnecttoLi-ionbatterypositiveterminal.Connect22-µFcapacitorfromVINpintoPGND.L4TheinductorisconnectedbetweenthispinandtheSWpin6.8-µHinductortoSW3SwitchingnodeoftheIC.ConnecttheinductorbetweenthispinandtheLpin.6.8-µHinductortoL1LDOandsynchronousboostconverter22-µFcapacitortoPGND.ConnectseriesresistorforcurrentlimitationtoeachLED(R,G,B).2SynchronousboostconverterpowerConnecttoground6,PowerinputandoutputforLi-ionConnecttoLi-ionbatterypositiveterminal.Connect1-µFcapacitorfromVBATpintoAGND.ROutputforRedLEDdriver.Theopen-drainoutputpullslowwhentheCTL_RpingoestoHlevel.RON=1Ω(typical)ConnecttoREDinputofRedGOutputforGreenLEDdriver.Theopen-drainoutputpullslowwhentheCTL_GpingoestoHlevel.RON=1Ω(typical)ConnecttoGREENinputofGreenBOutputforBlueLEDdriver.Theopen-drainoutputpullslowwhentheCTL_BpingoestoHlevel.RON=1Ω(typical)ConnecttoBLUEinputofBlueLEDdriverspowerConnecttogroundLDOoutput,fixed3.2V.TheoutputcurrentofVLOD1islimitedto20mA(um),whenbothEN_VLDOandEN_VLDO3inputpinsarelowlevel.1-µFcapacitortoLDOoutput,fixed3.21-µFcapacitortoLDOoutput,fixed3.21-µFcapacitortoLDOoutput,fixed3.01-µFcapacitortoSystemresetoutput,generatedaccordingtotheVLDO1outputvoltage(open-drainoutput).Connect100-kΩinternalpullupresistorbetweennRST_OUTandVLDO1.CanbeusedtoindicatetheresetoutputsignaltoMotordriveroutput.Theopen-drainoutputpullslowwhentheCTL_MTRpingoestoHlevel.RON=1Ω(typical)CanbeusedtodriveControlinputformotordriver(activeMotordrivercontrolinputsignalfromMotordriverpowerConnectgroundTERMINALFUNCTIONS EXTERNALREQUIREDCOMPONENTS(SEETYPICALAPPLICATION)Controlinputfor(Bpin)BlueLEDdriver(activeH)BlueLEDdrivercontrolinputsignalfromControlinputfor(Gpin)GreenLEDdriver(activeH)GreenLEDdrivercontrolinputsignalfromControlinputfor(Rpin)RedLEDdriver(activeH)RedLEDdrivercontrolinputsignalfromDigitalConnecttogroundPowerpathoutput.Thepowersupplyforeach10-µFcapacitortoAGND.RegardinganeffectofDCbiasoncapacitor,selectacapacitorthatcansecureatleast4.7-µFinworsecase.EnableinputforVLDO2,VLDO4andVLED4P25(activeH)LDO2,LDO4and4.25VLDOcontrolinputsignalfromEnableinputforLDO3controlinputsignalfromTestpin.NormallyControlinputforUSBsuspendedmode.ToreducesupplycurrentfromVBUS(activeH).USBsuspendedinputsignalfromogground(AGND)input.Thermalgroundshouldbesolderedtothe ogground,usethermalviatoconnecttogroundneforidealpowerdissipation.ConnectthePowerPADtoground UMover -airtemperaturerange(unlessotherwiseVBUS,VAC,PWR,SW,ISET1,–0.3toVVBAT,VLDO1,VLDO2,VDLO3,VDLO4,VLED4P25,VIN,L,R,G,B,–0.3tonCHEN,USB_SUSPEND,CTL_R,CTL_G,CTL_B,CTL_MTR,EN_VLDO,EN_VLDO3,nRST_OUT,VBUS_PG,VAC_PG,STAT1,STAT2–0.3toVBUS_PG,VAC_PG,nRST_OUT,STAT1,Junctiontemperature–40toStoragetemperature–65toMENDEDOPERATINGSupplyvoltageVSupplyvoltageVSupplyvoltage(VBAT)forlinearVSupplyvoltage(VBAT)for4.25-VboostVOperatingambient-OperatingjunctionPACKAGEDISSIPATIONθJATA<40°CDERATINGFACTORABOVETA=40°C(mW/°C)ELECTRICALover-10°C<TJ<125°C mendedsupplyvoltage(unlessotherwiseTESTINPUTActivesupplycurrentfromNoload,EN_VLDO=H,EN_VLDO3=H,nCHEN=H,USB_SUSPEND=L,VBAT=3.8V,VAC=5.25ActivesupplycurrentfromNoload,EN_VLDO=H,EN_VLDO3=H,nCHEN=H,USB_SUSPEND=L,VBAT=3.8V,VAC=5VBUScurrentatUSBsuspendNoload,EN_VLDO=H,EN_VLDO3=H,nCHEN=H,USB_SUSPEND=H,VBAT=2.8V,VAC=5.25ActivesupplycurrentfromNoload,EN_VLDO=H,EN_VLDO3=H,nCHEN=H,USB_SUSPEND=L,VBAT=4.2VBATstandbyNoload,EN_VLDO=L,EN_VLDO3=L,nCHEN=H,USB_SUSPEND=L,VBAT=4.2V,TJ=60°CSleepcurrentatSumofcurrentintoVBATpin.VBAT=2.5V<V(BATUVLO)AtnCHEN=Hstate#01,02,03,04,09,10,TJ=3UVLO/PGCOMPARATOR/OVERDISCHARGEPROTECTIONFORLI-PowergoodthresholdvoltageforAtVBUSpin,LtoVHysteresisvoltageonAtVBUSpin,V(VBUSPG)-V(VBUSPGHYS)thresholdvoltageforHtoPowergoodthresholdvoltageforAtVACpin,LtoVHysteresisvoltageonAtVACpin,V(VAC)-V(VACHYS)isthresholdvoltageforHtoLUndervoltagelockoutvoltageforAtVBATVMinimumVBATforoverdischargeAtVBATVLi-ionUVLOdeglitchOnlyforfallingedge(HtoPOWER VBUSandofaFETbetweenVBUS=4.75ofaFETbetweenVACandPWRVAC=4.75ofaFETbetweenVBATandPWRVABT=3.3VBAT=3.3V,EN_VLDO=L,EN_VLDO3=L5ΩELECTRICALover-10°CELECTRICALover-10°C<TJ<125°Cmendedsupplyvoltage(unlessotherwiseTESTLDOLDO4(COUT=1µF,3.4V<PWR<5.75VLDO4output3.4V<PWR<5.753VVLDO4output1VLDO4dropoutIO=150VVLDO4outputcurrentPowersupplyrejection-LDO1(COUT=1µF,3.4V<PWR<5.75VLDO1output3.4V<PWR<5.75VVLDO1output1VLDO1dropoutIO=100VVLDO1outputcurrentPowersupplyrejection- onΩRESETResetthresholdAtVLDO1,HtoVHysteresisvoltageforAtVLDO1,V(RST)+V(RSTHYS)isthresholdvoltageforLtoHLDO2(COUT=1µF,3.4V<PWR<5.75VLDO2output3.4V<PWR<5.75VVLDO2output1VLDO2dropoutIO=30VVLDO2outputcurrentPowersupplyrejection-LDO3(COUT=1µF,3.4V<PWR<5.75VLDO3output3.4V<PWR<5.75VVLDO3output1VLDO3dropoutIO=150VVLDO3outputcurrentPowersupplyrejection-TEST LINEARVOLTAGEREGULATION(VO(REG)+V(DOMAX)<VPWR,I(TERM)<IO(OUT)<550OutputVVoltageregulationTA=25°C,IO(OUT)=50-%-1Dropoutvoltage(V(PWR)-CURRENTOutputcurrentVPWR>VPWR-VVBAT>V(DO)VPWR>4.6VOutputcurrentsetVoltageonISET1VPWR=4.85V,IO(OUT)=550mAVBAT=4V VOutputcurrentsetVPWR=4.85V,IO(OUT)=60VBAT=2.8V,Pre-charge VPWR=4.85V,IO(OUT)=60mAVBAT=4V,CCmode VPWR=4.85V,IO(OUT)=550mAVBAT=4V,CCmode PRECHARGEANDSHORT-CIRCUITCURRENTtransiionthresholdVoltageonVBAT Vt(DEG-Deglitchtimeforfast-chargetoprechargetransitionVPWR(min)>4.6V,tFALL=10010-mVVBATdecreasingbelow Precharge0V<VPWR<V(LOWV),t<5PrechargesetVO(REG)=4.2V,0V<VPWR>V(LOWV),t< TERMINATIONVBAT>V(RCH),t<5ChargeterminationdetectionsetVO(REG)=4.2VVBAT>V(RCH),t< DeglitchtimeforterminationdetecionVPWR(min)>4.6V,tFALL=10010-mVoverdrive BATTERYRECHARGE RechargeTA=VO(REG)-VO(REG)-0.10VDeglitchtimeforrechargeVPWR(min)>4.6V,tFALL=100Decreasingbeloworincreasingabovethreshold,10-mVoverdrive Precharge sCharge sTimerfaultrecoveryDeglitchtimetoresettimerswhendisablingcharger BATTERYCHARGERON/OFF Chargeroffthreshold2.7V<VBAT<VPWR<VBAT+80VChargeronthreshold2.7V<VBAT<VPWR>VBAT+110VN-channelMOSFETbetweenISET2VAC=4.754ΩTEST4.25-VBOOSTANDLDO(COUT=22µF,L=6.8µH,CIN=22VLED4P25output3.2V<VBAT<4.3Vforboost4.6V<PWR<5.75VforVVLED4P25output14.25-V4.25-VLDOoutputcurrent4.6V<PWR<5.754.25-VLDOdropoutIO=140VPowersupplyrejection-4.25-V4.25-Vboostswitching4.25-Vboostoutputcurrent3.2V<VBAT<4.3betweenVINandLVBAT=3.2R,G,BN-channelMOSFETon-betweenRandLEDGND1ΩN-channelMOSFETon-betweenGandLEDGND1ΩN-channelMOSFETon-betweenBand1ΩMTRIN N-channelMOSFETon-betweenMTRINandMTRGND1ΩCTR_R,CTL_G,CTL_B,CTL_MTR,EN_VLDO,EN_VLDO3,USB_SUSPENDANDnCHEN LowlevelinputVLDO1=3.20.3xVHighlevelinputVLDO1=3.20.7xVPull-downresistorPull-downresistorPull-downresistorPull-downresistorPull-downresistorPull-downresistorPull-downresistorPull-upresistor(nCHEN)toVBUS_PG,VAC_PG High-leveloutputsaturation3.4V<PWR<5.75V,IO=-500µA,VDD=VLDO1VDD-VLow-leveloutputsaturation3.4V<PWR<5.75V,IO=500µA,VDD=VLDO1VSTAT1,STAT2 Low-leveloutputsaturationIO=2.5VnRST_OUT Low-leveloutputsaturationIO=2.5VPull-upresistor(nRST_OUT)toDeglitchtimeonTHERMALSHUTDOWN ThermaltripTJThermalTJFUNCTIONPowerPathTPS65471hasapower-pathcircuitrytochooseautomaticallyanyoneofUSB-port(VBUS),AC-DCadapter(VAC)andLi-ionbattery(VBAT)aspowersourceforLDOs.ThepriorityofpowerselectionisVBUS,VAC,thenVBAT.WhenbothVBUSandVACareavailable,VBUSisusedasthepowersourceofthechargerandLDOs.TheexceptionisUSBsuspendmode,inthiscases,powersourceofchargerandLDOsareprovidedtoPWRfromVAC.TheVBAT(Li-ionbattery)ischosenasapowersourcewhenbothVBUS(USB-port)andVAC(AC-DCadapter)arenotavailable.Inthiscase,thelinearchargerfunctiondoesnotoperate.showsanequivalentcircuitofthepowerpath.PowerFETsSW1,SW2andSW3areturnedon/offperandprovideappropriatepowersourcestoeachpoweroutput.

ToLDO1,Figure1.PowerPathAsshows,thestateofthelinearchargercircuitrydependsonthestateofthepowerpathcircuitry.Ifthepowerpathcircuitryisnotreadyforcharging,regardlessofnCHEN=L,thechargerfunctionisnotturnedon.Table1.PowerPathCircuitryTruthPOWERCHARGEXHLnCHEN=L:Recovery-XnCHEN=L:Recovery-XHLnCHEN=L:XnCHEN=L:HnCHEN=L:Recovery-LnCHEN=L:Recovery-HnCHEN=L:LnCHEN=L:USBSuspendTPS65471hasUSBsuspendfunction.USB_SUSPEND=HsendsTPS65471intoUSBsuspendmode.WhileinUSBsuspendmode,currentfromtheUSBhosttotheVBUSpinisreducedundertheUSBsuspendedcurrent.USBsuspendmodedoesnotdependonLi-ionbatterystatus.EveniftheLi-ionbatteryontheVBATpinisremovedorNG.VBUS,whichisinUSBsuspendmode,doesnotprovideelectricalpowerfor3.2-V,3-Vand4.25-Voutputsandtheseoutputsshouldbedisabled.EveninUSBsuspendmode,whenVACexists,sourcepowerisprovidedtothe3.2-V,3-Vand4.25-VoutputsfromVAC.ThisfunctioncomplieswithStandbyTPS65471entersstandbymodewhenthepowersourceLi-ionbattery(states#05#and#06#)andbothlogicinputsofEN_VLDOandEN_VLDO3areatLlevel.Whileinstandbymode,currentfromtheLi-ionbatterytotheVBATpinisreducedunderVVBAT(STBY).Thelow PMOSFETandNMOSFETareconnectedtoSW2betweenthePWRpinandVBATpininparallel.InorderfortheTPS65471todecreasethepowersupplycurrent,thePMOSFEToperatesinstandbymode.Instandbymode,thePMOSFETturnsoncorrespondingtotheoutputcurrentoftheVLDO1voltagedropofPWR.Torecoverfromstandbymode,thelogicinputofEN_VLDOorEN_VLDO3issettoHlevel,thenthelowNMOSFETconnectedbetweenPWRandVBATturnson.ThestartuptimeoftheLDOscontrolledtheselogicinputsignalsisapproximay1TimingDiagramsofPowerPathUSB-PortHot-PlugDuringBatteryOperation(AbsentVACandChargeOff,#5#→#7#→ConnectingConnectingDisconnectingUSBportVBATisVBATisgraterthanV(VBATUVLO)andVLOD1isgraterthanLiIonBattery Battery

VBUS

VBUS

Discharge Battery BatteryDischargeDischargeDischargePWR<VBATT,StarttoswitchSWPowerFETPowerFET

BoostBoostnRSTFigure2.USB-PortHot-PlugDuringBatteryOperation(#5#→#7#→#5#,ChargeOff,EN_VLDO=USB-PortHot-PlugDuringBatteryOperation(AbsentVACandChargeOn,#5#→#7#→ConnectingConnectingDisconnectingUSB-portVBUS

VBUS

BatteryLi-IonBatteryDischargeVBATDischargeVBATisgraterthanV(VBATUVLO)andVLOD1isgraterthanV(RST) Battery BatteryDischargeDischargePWR<VBATT,StarttoswitchSWPowerFETPowerFET

ChargingfunctionChargingfunctionisVBUSPG=LorVBUS<VBAT+thenChargingfunctionisBattery BoostBoostnRSTFigure3.USB-PortHot-PlugDuringBatteryOperation(#5#→#7#→#5#,ChargeOn,EN_VLDO=USB-PortHot-Plug(AbsentBatteryandVAC,#1#→#3#→ConnectingConnectingDisconnectingUSBportVBATisVBATislessthanLiIonBattery Battery

VBUS

DischargeVBUSDischargePowerFETPowerFET

125nRSTFigure4.USB-PortHot-Plug(AbsentBatteryandVAC,#1#→#3#→BatteryHot-Plug(AbsentVBUSandVAC,#1#→#5#→ConnectingConnectingDisconnectingBatteryLiIonBattery(VBAT

USBportbattery

BatteryPowerFETPowerFET

125nRSTFigure5.BatteryHot-Plug(AbsentVBUSandVAC,#1#→#5#→USBSuspendEnabling/Disabling(PresentVBUSandBattery,AbsentVAC,#7#→#6#→USBUSBVBUSUSBportBatteryLiIonBatteryVBUSVBUSBatteryPowerFETPowerFETnRSTBoostPWR<VBAT,thenStarttoswitchDischargeVBATisgraterthanV(VBATUVLO)andVLOD1isgraterthanDischargeVBUSisgraterthanFigure6.USBSuspendMode(#7#→#6#→#7#,EN_VLDO=TheTPS65471hasa3.2-VregulatorastheLDO1poweranditprovidesastableandaccuratevoltageof3.2V(±64mV).Complyingwith,LDO1keepsitsoperationduringPWRon.ThisLDOprovidesthepowersupplytothecircuitoflogicI/O.IfPWRpowerdecreases,dischargeresistorsatVLOD1willbeturnedonanddischargepowertotheremainingelectrode.TheTPS65471hasa3.2-VregulatorastheLDO2poweranditprovidesastableandaccuratevoltageof3.2V(±32mV).LDO2iscontrolledbylogicinputEN_VLDOandsourceofsupplyisPWR.ThisoutputisturnedoffwhentheEN_VLDOisL.Table2.OutputControlTruthH3.2V3V4.25VL0V0V0VH3.2VL0VTheTPS65471hasa3.2-VregulatorastheLDO3poweranditprovidesastableandaccuratevoltageof3.2V(±64mV).LDO3iscontrolledbylogicinputEN_VLDO3andsourceofsupplyisPWR.ThisoutputisturnedoffwhentheEN_VLDO3isL.TheTPS65471hasa3-VregulatorastheLDO4poweranditprovidesastableandaccuratevoltageof3V(±0.1V).LDO4iscontrolledbylogicinputEN_VLDO.ThisouputisturnedoffwhentheEN_VLDOisL.4.25-VTheTPS65471hasa4.25-VregulatorandsynchronousboostconverterastheLEDpower.Itprovidesastableandaccuratevoltageof4.25V(±85mV)connectedtotheVLED4P25.Theboostconverterisbasedonafixedfrequencypulse-width-modulation()controller.ThisoutputiscontrolledbylogicinputEN_VLDO.IfUSB-port(VBUSpin)orAC-DCadapter(VACpin)powersaredetected,the4.25-VLDOoperates(PWRsupplysource),andthe4.25Vsynchronousboostconverterstopsoperation.IfthevoltageonbothVBUSpinandVACpinarelessthanthePowerGoodvoltage,thepowerisprovidedtoVBATpinfromtheLi-ionbattery,thenthe4.25-Vsynchronousboostconverteroperatesandthe4.25-VLDOstopsoperation.Complyingwith,inUSBsuspendmode(evenifthevoltageofVBUSpinisgreaterthanV(VBUSPG))thesourceofsupplyisthebattery.R,GandTheTPS65471hasthreeopen-drainoutputsforLEDdrivers.TheRoutputiscontrolledbylogicinputCTL_R,theGoutputiscontrolledbyCTL_GandtheBoutputiscontrolledbyCTL_B.Forexample,theopen-drainoutputofRpullslow(On)whentheCTL_RpingoestoHlevel.Theopen-drainoutputturnsoffwhentheCTL_RisL.ThesefunctionscanoperatewhentheEN_VLDOisH.TheTPS65471hasoneopen-drainoutputforthemotordriver.TheMTRINoutputiscontrolledbylogicinputCTL_MTR.Theopen-drainoutputofMTRINpullslow(On)whentheCTL_MTRpingoestoHlevel.Theopen-drainoutputisturnedoffwhentheCTL_MTRisL.ResetTheTPS65471monitorsthestatusofVLDO1(LDO1)andhasresetgeneratorcircuitrytoindicatearesetsignaltothesystem.TheresetsignaloutputisLlevelwhenthevoltageofVLDO1islessthanV(RST),andHlevelwhenthevoltageofVLDO1isgreaterthanV(RST)+0.14V.TheResetpingoestoHleveltdly(RESET)afterinternalsignalgoestoH.TheResetterminalhasa100-kΩpull-upresistortoVLDO1.AlsotheoutputsofVLDO2,VLDO3,VDDO4andVLED4P25turnOffwhenthevoltageofVLDO1islessthanV(RST).If esgreaterthanV(RST)2.8V+1250.14V,theseoutputsareturnedOnatthe2.8V+125nRSTFigure7.TimingofnRST_OUTSignalWhenaVoltageDropOccursonChargeChargeChargeChargeSafetyPreconditioning CurrentRegulation VoltageChargeChargeChargeSafetyRegulationVoltageRegulationMinimumChargeAndTerminalFigure8.ChargingAlwaysFigure9.ChargingFlowBatteryPre-Duringachargecycle,ifthebatteryvoltageisbelowtheV(LOWV)threshold,thedeviceappliesapre-chargecurrent,IO(PRECHG),tothebattery.Thisfeaturerevivesdeeplydischargedcells.ResistorRSETn,connectedbetweenISET1andAGNDanalsobetweenISET1andISET2,determinesthepre-chargerate.TheV(PRECHG)andK(SET)parametersarespecifiedintheElectricalCharacteristicstable.V(PRECHG)RIO(PRECHG)R TPS65471activatesasafetytimer,t(PRECHG),duringtheconditioningphase.IftheV(LOWV)thresholdisnotreachedwithinthetimerperiod,thedeviceturnsoffthechargerandenunciatesFAULTontheSTATxpins.SeetheTimerFaultRecoverysectionforadditionaldetails.BatteryFast-ChargeConstantTheTPS65471offerson-chipcurrentregulationwithprogrblesetpoint.Resistor,RSETn,connectedbetweentheISET1andAGNDandalsoconnectedbetweenISET1andISET2,determinesthechargerate.TheV(SET)andK(SET)parametersarespecifiedintheElectricalCharacteristicstable.V(SET)RIO(OUT)R IfUSB-port(VBUSpin)isdetected,MOS-FETofNchannelsconnectedtoISET2turnsoff.ThechargecurrentisdeterminedbytheofRSET1connectedbetweenISET1andGND.IfAC-DCadapter(VACpin)isdetected,MOS-FETofNchannelconnectedtoISET2turnson.ThechargecurrentisdeterminedbytheofRSET1andRSET2.WhenbothVBUSandVACarepresent,thechargecurrentisdeterminedby ofRSET1connectedbetweenISET1andFigure10.EquivalentCircuitISET1andISET2BatteryFast-ChargeVoltageThevoltageregulationfeedbackisthroughtheVBATpin.Thisinputistieddirectlytothepositivesideofthebatterypack.Thedevicemonitorsthebattery-packvoltagebetweentheVBATandAGNDpins.WhenthebatteryvoltagerisestotheVO(REG)threshold,thevoltageregulationphasebeginsandthechargingcurrentbeginstoAsasafetybackup,thedevicealsomonitorsthechargetimeinchargemode.Ifchargeisnotterminatedwithinthistimeperiod,t(CHG),thechargeristurnedoffandFAULTissetontheSTATxpins.SeetheTimerFaultandRecoverysectionforadditionaldetails.ChargeTerminationDetectionandTheTPS65471monitorsthechargingcurrentduringthevoltageregulationphase.Oncetheterminationthreshold,I(TERM),isdetected,chargeisterminated.TheV(TERM)andK(SET)parametersarespecifiedintheV(TERM)RIO(TERM)R Afterchargetermination,thedevicerestartsthechargeoncethevoltageontheVBATpinfallsbelowtheV(RCH)threshold.Thisfeaturekeepsthebatteryatfullcapacityatalltimes.Thedevicemonitorsthechargingcurrentduringthevoltageregulationphase.Oncetheterminationthreshold,I(TERM),isdetected,thechargeristerminatedimmediay.ResistorsRSETn,connectedbetweentheISET1andAGNDandalsoconnectedbetweenISET1andISET2,determinethecurrentlevelattheterminationthreshold.ChargeStatusTheopen-drainSTAT1andSTAT2outputsindicatevariouschargeroperationsasshowninThesestatuspinscanbeusedtocommunicatetothehostprocessor.Notethatthisopen-drainoutputispoweredbyVLDO1andanexternalpull-upresistorshouldbeapplied.lso,notethatOFFindicatestheopen-draintransistoristurnsoff.Table3.StateofSTAT1/STAT2CHARGEPre-chargeinFastchargeinChargeChargesuspend,TimerAnydevicestateexcept#07#,#08#,#11#,#12#ofChargeEnableThenCHENdigitalinputcancontrolastateofthechargerfunction.IfnCHENisHlevel,TPS65471stopsallchargefunctionsandturnsthechargeroff.TimerFaultAsshownin,thedeviceprovidesarecoverymethodtodealwithtimerfaultconditions.Thefollowingsummarizesthismethod:ConditionNumber1:Chargevoltageaboverechargethreshold(V(RCH))andtimeoutfaultRecoveryMethod:Thedevicewaitsforthebatteryvoltagetofallbelowtherechargethreshold.Thiscouldhappenasaresultofaloadonthebattery,self-discharge,orbatteryremoval.Oncethebatteryvoltagefallsbelowtherechargethreshold,thedeviceclearsthefaultandstartsanewchargecycle.APORornCHENtogglealsoclearsthefault.ConditionNumber2:Chargevoltagebelowrechargethreshold(V(RCH))andtimeoutfaultRecoveryMethod:Underthisscenario,thedeviceappliestheI(FAULT)current.Thissmallcurrentisusedtodetectabatteryremovalconditionandremainsonaslongasthebatteryvoltagestaysbelowtherechargethreshold.Ifthebatteryvoltagegoesabovetherechargethreshold,thenthedevicedisablestheI(FAULT)currentandexecutestherecoverymethoddescribedforConditionNumber1.Oncethebatteryfallsbelowtherechargethreshold,thedeviceclearsthefaultandstartsanewchargecycle.APORornCHENtogglealsoclearsthefault.OverDischargeTPS65471monitorsthevoltageofLi-ionbatteryandprotectsitfromoverIfthevoltageonVBATpinisunderV(BATUVLO),thecurrentpathfromVBATtothedeviceiscutoffandthecurrentfromtheLi-ionbatterywillbeminimized(<IBAT(ODP))asmuchaspossible.ThiscanpreventearlybatteryInthiscase,iftheUSB-portpowersourceconditionorAC-DCadaptorpowersourceisgood(state#03#,#04#,#09#,#10#),chargefunctioncanbeenabledbynCHEN=L.Chargeoperationmustbestartedfromthepre-conditioningphase.Whenthepre-conditioningphaseexceedsV(BATUVLO),thestateofTPS65471changesto(#07#,#08#,#11#,#12#).ThermalShutDownWhenthejunctiontemperatureofTPS65471increaseshigherthanT(SHTDWN),thethermalshutdownfunctionisDuringastateofthermalshutdown,allfunctions(forthecharge,powerpathsLDO1,LDO2,LDO3,LDO4and4.25-VBoost/LDO)areturnedoffandanycurrentisshutoff.IfthejunctiontemperaturedecreaseslessthanT(SHTDWN),(Note:-15°C(typical)hysteresis)TPS65471goesbacktonormaloperation.Inthiscase,timersinthechargerarenotcleared.Thechargertimermaintainsoperation.APPLICATIONBehavioroftheChargerWithoutLi-IonBatteryonVBATIfchargerfunctionisactivatedwithouttheLi-ionbatteryontheVBATpin,thechargershowsthebelowVoltagelevelofVBATpingoesto4.2Aftert(TRMDET)haspassed,thechargerfunctionisturnedoff.ThenthevoltagelevelontheVBATpingoestoSincethevoltagelevelontheVBATpin elessthanVO(RCH),aftert(DEGL)turnsoff,thechargerfunctionisactivatedagain.ReturntoConditionVBUS>V(VBUSPG)orVAC>V(VACPG)nCHEN=L（ RemovingFigure11.VBATWaveformWhenChargingWithoutBatteryBehaviorsIfaShortVLDO1OutputShortedtoIfashort-circuitoccursbetweenthe3.2-VLDOoutput(VLDO1)andGND,thecurrentislimitedbytheLDO’scurrentlimit.IfLDOisheatedbythecurrentandvoltage,thermalshutdownisactivated(dependingonambienttemperatureandPCBstructure).VLDO2,VLDO4orVLED4P25OutputShortedtoIfashort-circuitoccursbetweentheoutputandGND,thecurrentislimitedbytheLDO'scurrentlimit.IftheseoutputterminalsdecreasebelowLVP(lowvoltageprotection),thesepoweroutputswillbeturnedoffandthisstatewillbeheld.Inaddition,ifanyoutputofVLDO2orVLDO4orVLED4P25isconnectedtoGND,alltheoutputscontrolledbythesignalofEN_VLDOareturnedoff.Recoverymethod,EN_VLDOpingoestoLlevelatonce,thengoestoHlevel.VLDO3OutputShortedtoIfashort-circuitoccursbetweenthe3.2-VLDOoutput(VLDO3)andGND,thecurrentislimitedbytheLDOcurrentlimit.IfthisoutputterminaldecreasesbelowLVP,thepoweroutputwillbeturnedoffandthisstatewillbeheld.Recoverymethod,EN_VLDO3pingoestoLlevelatonce,thengoestoHlevel.PWRShortedto(VBATpin)Li-ionbatteryprovidespowertoPWR.Ifashort-circuitisdetectedonthePWRpin,power-pathSW2goestohigh-modeimmediayandlimitsthiscurrent.IftheSW2isheatedbythecurrentandvoltage,thermalshutdownisactivated(dependingonambienttemperatureandPCBstructure).(VBUSpinorVACpin)USB-portorAC-DCadaptorpowerprovidepowertoPWR.Ifashort-circuitisdetectedonthePWRpin,currentflowsthroughpower-pathSW1fromVBUStoPWR.ThiscurrentislimitedbyinternalcurrentlimitonSW1.Shortcurrentflowthroughpower-pathSW3fromVACtoPWRislimitedbyinternalcurrentlimitonSW3.IfSW2orSW3isheatedbythecurrentandvoltage,thermalshutdownisactivated(dependingonambienttemperatureandPCBstructure).VBATShortedtoIfVBATisshortedtoGND,aprotectionICinthebatterypackwillprotecttheBILLOFTable mendedInductorsandCeramic1.0Ceramic1.0Ceramic1.0Ceramic10RegardinganeffectofDCbiasonthecapacitor,selectacapacitorthatcansecureatleast4.7µFinworstcase.Ceramic1.0Ceramic1.0Ceramic1.0Ceramic1.0Ceramic22Ceramic22andL6.8NR4018T6R8M:TAIYOYUDENLAYOUTAsforallswitchingpowers,thelayoutisanimportantstepinthedesign,especiallyathighpeakcurrentsandhighswitchingfrequencies.Ifthelayoutisnotcarefullydone,theregulatorcouldshowstabilityproblemsaswellasEMIproblems.Usewideandshorttracesforthemaincurrentpath